Climate Change Data Portal
| DOI | 10.1016/j.chemgeo.2011.01.021 |
| Microbial reduction of chlorite and uranium followed by air oxidation | |
| Zhang, Gengxin; Burgos, William D.; Senko, John M.; Bishop, Michael E.; Dong, Hailiang; Boyanov, Maxim I.; Kemner, Kenneth M. | |
| 通讯作者 | Burgos, WD (通讯作者) |
| 发表日期 | 2011 |
| ISSN | 0009-2541 |
| EISSN | 1872-6836 |
| 起始页码 | 242 |
| 结束页码 | 250 |
| 卷号 | 283期号:3-4 |
| 英文摘要 | To evaluate the stability of biogenic nanoparticulate U(IV) in the presence of an Fe(II)-rich iron-bearing phyllosilicate, we examined the reduction of structural Fe(III) in chlorite CCa-2 and uranium(VI) by Shewanella oneidensis MR-1, and the reoxidation of these minerals (after pasteurization) via the introduction of oxygen. Bioreduction experiments were conducted with combinations of chlorite. U(VI), and anthraquinone-2,6-disulfonate (AQDS). Abiotic experiments were conducted to quantify the reduction of U(VI) by chemically-reduced chlorite-associated Fe(II), the oxidation of nanoparticulate U(IV) by unaltered structural Fe(III) in chlorite, and the sorption of U(VI) to chlorite, to elucidate interactions between U(VI)/U(IV) and Fe(II)/Fe(III)-chlorite. Solids were characterized by X-ray diffraction, scanning electron microscopy, and X-ray absorption spectroscopy to confirm Fe and U reduction and reoxidation. U(VI) enhanced the reduction of structural Fe(III) in chlorite and nanoparticulate U(IV) was oxidized by structural Fe(Ill) in chlorite, demonstrating that U served as an effective electron shuttle from S. oneidensis MR-1 to chlorite-Fe(III). Abiotic reduction of U(VI) by chlorite-associated Fe(II) was very slow compared to biological U(VI) reduction. The rate of nanoparticulate U(IV) oxidation by dissolved oxygen increased in the presence of chlorite-associated Fe(II), but the extent of U(IV) oxidation decreased as compared to no-chlorite controls. In identical experiments conducted with bioreduced suspensions of nanoparticulate U(IV) and nontronite (another iron-bearing phyllosilicate), the rate of U(IV) oxidation by dissolved oxygen increased in the presence of nontronite-associated Fe(II). In summary, we found that structural Fe(III) in chlorite delayed the onset of U(VI) loss from solution, while chlorite-associated Fe(II) enhanced the oxidation rate of U(IV) by dissolved oxygen, indicating that chlorite-associated Fe(II) could not protect nanoparticulate U(IV) from oxygen intrusion but instead increased the oxidation rate of U(IV). (C) 2011 Elsevier B.V. All rights reserved. |
| 关键词 | QUANTITATIVE ASSAYU(VI) REDUCTIONCLAY-MINERALSFE(III)DISSOLUTIONSORPTIONSPECIATIONILLITEU(IV)IRON |
| 英文关键词 | Smectites; Phyllosilicates; Uraninite; Iron reduction |
| 语种 | 英语 |
| WOS研究方向 | Geochemistry & Geophysics |
| WOS类目 | Geochemistry & Geophysics |
| WOS记录号 | WOS:000289822000013 |
| 来源期刊 | CHEMICAL GEOLOGY
 |
| 来源机构 | 中国科学院青藏高原研究所 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/257956 |
| 推荐引用方式 GB/T 7714 | Zhang, Gengxin,Burgos, William D.,Senko, John M.,et al. Microbial reduction of chlorite and uranium followed by air oxidation[J]. 中国科学院青藏高原研究所,2011,283(3-4). |
| APA | Zhang, Gengxin.,Burgos, William D..,Senko, John M..,Bishop, Michael E..,Dong, Hailiang.,...&Kemner, Kenneth M..(2011).Microbial reduction of chlorite and uranium followed by air oxidation.CHEMICAL GEOLOGY,283(3-4). |
| MLA | Zhang, Gengxin,et al."Microbial reduction of chlorite and uranium followed by air oxidation".CHEMICAL GEOLOGY 283.3-4(2011). |
| 条目包含的文件 | 条目无相关文件。 | |||||
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。
